If water is leaking from the base of your tap (where it meets the sink), the cause is usually worn internal seals, loose fittings, or a damaged O-ring rather than a cracked pipe.
A base leak can look serious, but it is often caused by small components that wear over time.
The Most Common Reasons This Happens
1. Worn O-Ring
Most taps have rubber O-rings inside the base that prevent water from escaping. Over time, these can dry out, crack, or flatten.
When this happens, water can seep out around the base.
This is one of the most common causes.
2. Loose Mounting Nut
Underneath the sink, a securing nut holds the tap in place. If it loosens slightly, water can leak and collect around the base.
Tightening the fitting may resolve the issue.
3. Worn Internal Cartridge
If the cartridge inside the tap is worn, water may travel in unintended directions and escape from the base.
If you’re also hearing noise while using the tap, see:
4. Sealant Deterioration
Some taps rely on sealant where they meet the sink. Over time, this can break down and allow water to pass underneath.
5. Excessive Water Pressure
High water pressure can force water through small gaps or weakened seals.
If multiple taps are affected, pressure may be contributing.
Is This Normal?
It may be minor if:
• The leak is slow
• It only occurs when the tap is running
• There are no signs of cabinet damage
It may require attention if:
• Water pools under the sink
• The leak continues even when the tap is off
• You notice swelling or damage to cabinetry
If water pressure is low instead of leaking, see:
→ Why Is My Tap Water Pressure Low?
What You Can Do
If your tap is leaking at the base, you can:
• Tighten the mounting nut under the sink
• Inspect visible seals
• Replace worn O-rings
• Check for excessive water pressure
If the leak continues after tightening fittings, replacing internal seals or the cartridge often resolves the issue.
For more related issues, see: